OpenAI ships GPT-5.6 — Sol, Terra, and Luna — into GitHub Copilot and Vercel AI Gateway

OpenAI's new GPT-5.6 family arrived on 2026-07-09 in three task-matched variants: Sol, Terra, and Luna. It is rolling out inside GitHub Copilot — where you pick the variant per job — and is live on Vercel's AI Gateway with bring-your-own-key support and no gateway markup.

What it means A new frontier family with three cost/capability tiers landing the same day across the two tools most builders already use means you can A/B it in your own stack today — no waitlist.